Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method for performing a phase tracking in a wireless communication system, the method performed by a User Equipment and comprising: receiving, from a base station, a Demodulation Reference Signal (DMRS) configured according to a specific pattern through a DMRS symbol; receiving, from the base station, a plurality of reference signals used for the phase tracking, wherein the plurality of reference signals is transmitted on a specific antenna port, and received through a specific resource region identical to at least one different reference signal transmitted on a different antenna port for the phase tracking; and performing the phase tracking based on at least one of the DMRS or the plurality of reference signals, wherein the DMRS and the plurality of reference signals are generated through identical Orthogonal Cover Code or identical Discrete Fourier Transform (DFT) code.
This technical summary describes a phase tracking method in wireless communication systems, addressing phase noise and signal distortion challenges in high-frequency or high-mobility environments. The method involves a User Equipment (UE) receiving a Demodulation Reference Signal (DMRS) from a base station, configured in a specific pattern within a DMRS symbol. Additionally, the UE receives multiple phase-tracking reference signals transmitted on a designated antenna port, occupying a specific resource region that overlaps with at least one other reference signal from a different antenna port. The phase tracking process utilizes either the DMRS, the phase-tracking reference signals, or both, to compensate for phase variations. Both the DMRS and the phase-tracking reference signals are generated using identical Orthogonal Cover Codes or Discrete Fourier Transform (DFT) codes, ensuring consistent signal processing. This approach enhances phase tracking accuracy by leveraging shared resource regions and synchronized coding, improving signal reliability in dynamic wireless conditions.
2. The method of claim 1 , wherein the DMRS and the plurality of reference signals are precoded through an identical precoder.
3. The method of claim 1 , wherein the plurality of reference signals is identical to the symbols in the specific resource region, respectively.
4. The method of claim 1 , wherein the plurality of reference signals is identical to the at least one different reference signal.
5. The method of claim 1 , wherein the specific resource region is configured on a frequency tone identical to the DMRS in a frequency domain.
6. The method of claim 1 , further comprising: generating an effective channel of each symbol using the DMRS, wherein performing the phase tracking includes: tracking the generated effective channel of each symbol; and tracking a phase difference between symbols using one of the DMRS or the plurality of reference signals.
7. The method of claim 1 , wherein the plurality of reference signals is configured according to a specific pattern in a time domain.
This invention relates to wireless communication systems, specifically methods for transmitting and receiving reference signals to improve channel estimation and signal quality. The problem addressed is the need for efficient and accurate reference signal configurations to enhance communication reliability in dynamic wireless environments. The method involves transmitting a plurality of reference signals, where these signals are arranged according to a specific pattern in the time domain. This time-domain pattern optimizes signal detection and channel estimation by ensuring that reference signals are distributed in a way that accounts for time-varying channel conditions. The pattern may include periodic, aperiodic, or adaptive configurations to match the requirements of different communication scenarios, such as high-mobility or low-latency applications. The reference signals are used to estimate the channel characteristics between a transmitter and a receiver, allowing for accurate demodulation and decoding of data signals. By configuring the signals in a structured time-domain pattern, the method reduces interference, improves synchronization, and enhances overall system performance. The pattern may also be adjusted dynamically based on feedback or predefined criteria to adapt to changing conditions. This approach is particularly useful in advanced wireless systems, such as 5G and beyond, where reliable channel estimation is critical for supporting high data rates and low-latency communications. The time-domain pattern ensures that reference signals are placed optimally to provide consistent and accurate channel state information, thereby improving the efficiency and robustness of wireless transmissions.
8. The method of claim 7 , further comprising: receiving, from the base station, pattern information representing the specific pattern, wherein the specific pattern is a time pattern of which overhead is greatest between a first time pattern of the User Equipment and a second time pattern of different User Equipments scheduled with the User Equipment.
This invention relates to wireless communication systems, specifically optimizing resource allocation in cellular networks to reduce overhead. The problem addressed is the inefficiency in managing overhead signals between a base station and multiple user equipment (UE) devices, particularly when different UEs are scheduled simultaneously. Overhead signals, such as synchronization and control information, consume valuable bandwidth and processing resources, especially when multiple UEs are active. The invention describes a method for dynamically adjusting the time pattern of overhead signals based on the scheduling of UEs. A base station transmits pattern information to a UE, specifying a time pattern where overhead is maximized. This pattern is determined by comparing the UE's own time pattern with those of other UEs scheduled at the same time. The goal is to minimize redundant overhead transmissions by aligning or staggering overhead signals to reduce interference and improve efficiency. The base station may adjust the pattern based on real-time scheduling decisions, ensuring that overhead is optimized for the current set of active UEs. This approach helps conserve bandwidth and processing power, leading to better overall network performance.
9. The method of claim 7 , further comprising: receiving, from the base station, scheduling information of different User Equipments scheduled with the User Equipment, wherein the specific pattern is a time pattern of the User Equipment, and wherein the reference signal is transmitted in a resource region in which an interference with the different User Equipments is not occurred among the specific resource region based on the scheduling information.
10. A User Equipment for performing a phase tracking in a wireless communication system, the User Equipment comprising: a communication unit for transmitting and receiving a radio signal with an exterior; and a processor functionally connected to the communication unit, wherein the processor is configured to: receive, from a base station, a Demodulation Reference Signal (DMRS) configured according to a specific pattern through a DMRS symbol; receive, from the base station, a plurality of reference signals used for the phase tracking, wherein the plurality of reference signals is transmitted on a specific antenna port, and received through a specific resource region identical to at least one different reference signal transmitted on a different antenna port for the phase tracking; and performing the phase tracking based on at least one of the DMRS or the plurality of reference signals, wherein the DMRS and the plurality of reference signals are generated through identical Orthogonal Cover Code or identical Discrete Fourier Transform (DFT) code.
11. The User Equipment of claim 10 , wherein the DMRS and the plurality of reference signals are precoded through an identical precoder.
This invention relates to wireless communication systems, specifically improving the performance of user equipment (UE) in handling demodulation reference signals (DMRS) and reference signals. The problem addressed is the need for efficient and accurate signal processing in multi-antenna systems where multiple reference signals are transmitted alongside DMRS to support channel estimation and data demodulation. The UE includes a receiver configured to receive a plurality of reference signals and a DMRS from a base station. The reference signals and DMRS are used for channel estimation and data demodulation, respectively. The UE further includes a processor that processes these signals to extract channel state information and demodulate received data. A key feature is that both the DMRS and the plurality of reference signals are precoded using an identical precoder. This ensures consistency in signal processing, reducing complexity and improving reliability in channel estimation and data demodulation. The identical precoding helps maintain coherence between the reference signals and DMRS, which is critical for accurate channel tracking in dynamic wireless environments. The UE may also include a transmitter for sending feedback or control information to the base station based on the processed signals. This invention enhances signal integrity and system efficiency in advanced wireless communication systems.
12. The User Equipment of claim 10 , wherein the processor is configured to: generate an effective channel of each symbol using the DMRS, track the generated effective channel of each symbol; and track a phase difference between symbols using one of the DMRS or the plurality of reference signals.
13. The User Equipment of claim 10 , wherein the processor is configured to: receive, from the base station, pattern information representing the specific pattern, wherein the plurality of reference signals is configured according to a specific pattern in a time domain, and wherein the specific pattern is a time pattern of which overhead is greatest between a first time pattern of the User Equipment and a second time pattern of different User Equipments scheduled with the User Equipment.
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March 9, 2021
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